24
21 - FAULT FINDING GUIDE, SYMPTOMS AND POSSIBLE CAUSES
Important :
In instances where it is indicating that the main control system needs changing, (specifically the 3 Button High
Level or Thermatronic Control Systems), you should investigate returning the whole Burner Control Assembly to Nu-Flame for recti-
fication as this could be the least cost option.
a.
Prior to any Servicing ensure that you have carried out the procedures in Section 20.1 General (Servicing).
b.
Check the supply pressure at the isolation elbow.
c. Important
: With the High Level and Thermatronic Systems always change the batteries before carrying out any Fault
Finding.
21.1 - RESETTING THE ELECTRONIC CONTROL (Applies to Thermatronic RF System Only)
Full Reset -
If a new handset is obtained the control system will need to learn the handset’s unique code via a Full Reset.
Also, if the fire is not working and the Basic Reset (described on page 6) has not worked a Full Reset can be carried out:
a.
Remove the Ash Pan Cover and locate the electronic Receiver Box.
b.
Locate the Reset Hole on the side of the Receiver and using a pen press and hold in the Reset button until you hear two beeps.
c.
The first beep is short and the second beep is long. After the second beep release the Reset Button.
d.
Now on the Handset, within the next 20 seconds press and hold the Small Flame Button until you hear two additional short
beeps confirming the code is set in the Receiver.
e.
If you hear one long beep the Code as not been set so repeat the procedure.
f.
If the Handset still does not work check the wiring and or replace the Receiver and Handset .
21.2 - NO SPARK IGNITION
a.
Replace the batteries in the Receiver and Handset (The 3 Button High Level Switch as Receiver Batteries only).
b.
Check there is no dust/debris shorting out the electrode or blocking gas from the pilot.
c.
Check the condition of the Ignition lead and ensure it is connected to both the ignition electrode and /or High Level Control or
receiver. Check that the Ignition lead is not trapped and or shorting, replace if required. For the Manual System this will involve a
new control. For the High Level Control an the Thermatronic System a separate ignition lead is available.
d.
Check that gas is flowing from the pilot during the ignition sequence. Clean or Replace as required.
e.
For the 3 Button High Level Control & Thermatronic Radio Frequency versions only, listen to the control to hear if the pilot gas
solenoid is opening. Change the Receiver and High Level Switch or the Handset (which ever applies) at the same time and/or
gas control. Refer to Diagram for Cable connections in Section 22.
21.3 - PILOT GOES OUT AFTER FIRST LIGHTING
a.
Check there is no debris blocking the flame to the thermocouple.
b.
Check the thermocouple is tightly connected to the control.
c.
Change the pilot assembly as a new thermocouple may be required.
d.
With the Manual System or 2 Button High Level Control change the Controls.
e.
For the 3 Button High Level Control & Thermatronic Radio Frequency versions only, listen to the control to hear if the pilot gas
solenoid is opening. Change the Receiver and High Level Switch or the Handset (which ever applies) at the same time and/or
gas control. Refer to Diagram for Cable connections in Section 22.
f.
Also see Section 21.4
21.4 - PILOT LIGHTS BUT MAIN BURNER DOES NOT LIGHT
a.
With All Control Systems listen to hear if gas is flowing into the main burner.
b.
Check there is no dust or debris blocking the flame from the pilot to the main burner.
c.
With the 2 Button High Level Control check that both Control Knobs are in the on position, fully turned anti clockwise.
Also check
‘e’
before determining the action required.
d.
With the 3 Button High Level & Thermatronic System check if the main control knob on the control is turning to the high setting
and listen to hear if the valve is opening. If not change the Handset & Switch (which ever applies) and at the same time the gas
control.
For removal of the 3 Button Switch refer to
‘f’
and also refer to the Diagram for Cable connections in Section 22.
Also check
‘g’
(below) before considering replacing any parts. You should also consider the
Important
note in 21.1.
e.
With the 2 Button High Level Control it is possible for the Main Burner to light when first lit after lighting the Pilot but then the
Push Buttons do not operate the control. Operate the bottom button and listen to see if the Control Knob turns. If it does not then
change the batteries, if still a problem change the Switch Assembly as detailed in
‘f’
.
f.
For removal/replacement of the 2 & 3 Button Switches first remove the 2 screws retaining the Switch Shield, remove the 2
screws retaining the Switch Assembly. Disconnect the push on wire connections at the control. Remove the switch and wires
and replace with a new component in reverse order.
g.
All Control Systems have a Pressure Test Point to allow the Burner Pressure to be checked to confirm if gas is flowing from the
control. On the Manual Control it is visible at the front left of the control. On the High Level Controls it is on the left of the
control and on the Thermatronic it is at the front of the Control and is the left/rear Pressure Test Point.
h.
Check if the main injector is blocked. Clean or Replace.
21.5 - PILOT FLAME SHORTENS, OR GOES OUT WHEN MAIN BURNER IS SELECTED
a.
Monitor the supply pressure at the isolation elbow as the main burner lights. If pressure drops, check gas pipe sizing, quality of
pipe bending. Check for debris in the gas supply and or gas filter if fitted.
b.
Check that another appliance is not affecting the gas supply pressure.